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cathode vu meter





dont know if you guys have any knowledge about cold cathode tubes... but the more voltage you put into the cathode the higher the light rises up the tube. Now i was thinking i could use this to make a VU meter - when the bass kicks in my car the light shoots up the stick... Any ideas how i would go about making this? (light to sound veriable resistor).

cheers

al
 


You can get LED lights that flash in time to the music, maybe the controller unit from one of those, i wouyld imagine they work on the same priniciple.

I would imagine it would use a sound sensitive resistor to vary voltage supply.
 


hmm yeah, i presume there is a kit already out to do this... everything i find on google simply switches on/off to sound instead of variable voltage.... ill keep looking :confused:
 


went maplins yesterday... they had quite a few sound to light kits... none that did variable voltage tho + they were all make it your self circuits.
 
  Polo + Micra


yeah just take a supply from the amp output and put in a diode and correct resisitor then put it into the cold catode inverter
 


ok.. this is sounds good :) i did actually wire the cathode inverter to the amp output before... worked brill but the inverter didnt like it too much and fryed! Do you know what diode/resistor im best using?...

cheers!

al
 
  Polo + Micra


i think you will want a rectifing diode so it only allows dc to go to the inverter

you would have to measure the output voltage of the amp to find out what resistor you will you will probably need a 2 watt resitor aswell

dink
 


made the cathode vu meter! didnt work as well as i expected tho.... might have a go with a srtip of high powered leds and some resistors...

al
 


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